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Amazon.com : POLAR H10 Heart Rate Monitor, Bluetooth HRM Chest Strap - iPhone & Android Compatible, Black : Sports & Outdoors
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Bluetooth 4.0 Wireless Sport Heart Rate Monitor Pulse Meter Sensor Chest Strap Polar Band Belt Heart Rate Monitor Bluetooth Ant+ - Outdoor Fitness Equipment - AliExpress
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Amazon.com : Polar H9 Heart Rate Sensor – ANT + / Bluetooth - Waterproof HR Monitor with Soft Chest Strap for Gym, Cycling, Running, Outdoor Sports : Sports & Outdoors
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